Pump



,484 April 26, 1927. w, J. SMITH- PUM Filed Nov. 24, 1926 s Sheets-Sheet 1' W. J. SMITH April 26,1927.

PUMP

Filed Nov 24, 1926 s Sheets-Sheet 2 W. J. SMITH April 26 1927.

PUMP

' Filed Nov. 24, 1926 s sheetssheet 5 Patented Apr. 26, 1927.

UNITED STATES 1,626,484 PATENT OFFICE.

WILLIAM J. SMITH, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO B. JAMES MOCAFFBEY, OF PHILADELPHIA, PENNSYLVANIA.

PUMP.

Application filed November 24, 1926. Serial No. 150,480.

This invention relates to pumps, and it relates particularly to that class of pumps which include cylinders in which are eccentrically disposed rotary pistons each bearing at one point on the interior face of its cylinder, the pistons being provided with slidable vanes the outer ends of which are maintained constantly in contact with the inner faces of the cylinders.

The object of the invention is to provide a pump of the general character referred to, in which a plurality of cylinders and pistons shall be so .,.aggrouped and connected as to draw into the pump two or more gases, or a gas and a. substance in a finely divided condition or spray, commingle the two, put the mixture under pressure, and then expel the mixture through a contracted discharge opening.

Another object of the invention is to provide in a pump of the kind referred to means wherebywhen, for instance, a liquid is introduced into the pump and mixed with a gas, any portion of the liquid which may be in suificiently large globules to cause it to separate from the mixture, and to precipitate in the pump, shall automatically be removed from the pump, conveyed to the source of supply of the liquid, and utilized.

A further ob ect of the invention is to provide in the pump such a construction and relative disposal of the parts that, when a liquid is introduced in the form of a spray, combined with a gas, compressed, etc., the liquid shall be brought into contact with the bearing of the driving shaft of the pump in such manneras to serve to lubricate the shaft continuously in the operation of the Pu P- The pump hereinafter described. and claimed is adapted for drawing in, mixing, putting under pressure, and then discharging in the form of a s ray or vaporv a great variety of gases and j uids and solids in a finely divided condition. By its form it is particularly adapted for use in supplying gaseous fuel for heating plants, etc., for the reason that all the principal working parts are rotary, and may, therefore, be operated at the required high speed without vibration, without undue wear ofthe contacting parts, and without noise.

In the following description the pump is described as operating to combine and compress a mixture of oil in the form of spray or vapor, and air, to produce a fuel for heat ing plants. It is not.theintention to thus limit the scope of the invention, as an understanding ofit will make clear the fact that it is capable of use in combining and compressing a' great variety of gases with and its coacting parts is shown in the accoin an in drawin s in which:

Figure 1 is a plan view of the pump,

showing an operating electric motor attached thereto.

Figure 2 is a side view of the pump and motor.

Figure 3 is a central horizontal sectional view of the pump.

' Figure 4 is a vertical sectional view taken on the line 4-4 of Figure 3.

Figure 5 is a central vertical sectional view of the pump, and

Figure 6 is a detail view of the oil injector employed.

As hereinshown, the working parts of the pump are attachedto and sustained by a standard or frame, consisting principally of the main upright, central portion 1, having therein an opening 2 forming a bearing for the operating shaft 3. The standard has formed in it, on opposite sides, the annular chambers 4, 5, which form the principal parts of the cylinders in which the rotary pistons employed are located.

The outer face of the chamber 4 is formed by a removable plate 5' which has on it a hub 6 formed w1th an openin through it for receiving the shaft 3 and forming a bearing therefor. Arranged in the hub 6 and surrounding the shaft is a stufling box.7

by which the escape of air placed under 100 pressure in the chamber 4 is prevented from escapin between the shaft and the hub.

The s aft 3 extends through the chamber 4 at a point a short distance above the center of the chamber, and secured to the shaft and located in the chamber is the rotatable annular piston 8, which is of a, diameter'to bear against the upper face of the chamber. The piston 8 has in it the radial grooves 9, in

which are located the slidable vanes outer ends of I "which are maintained iii 'contact with the wall of the chamber bymeans,

Extending through the side wall of the.

chamber 4 and communicating with the space between the piston 8 and-"thexchambercis an.

air pipe or conduit 12 provided with means, such as a valve 13, by which'the quantity of air admitted to the chamber 4 is governed. Air admitted-through'the conduit 12 is successively contactedwith by the vanes of the piston 8 which rotates in the direction indicated by the arrow in Figure 4. By this means the airis put under pressure as it is carried by the vanes to a point opposite the place of admission, where it is conducted through an opening 14 which communicates with a conduit 15 formed in the central portion 1 of the standard.

. At the point of discharge of the air under pressure into the conduit 15 oil is introduced, commingled with the air, and forced through the conduit 15, and thence through an opening 16 into the compression chamber 5 in the form of a spray. The commingling of the oil with the air under pressure isaccomplished by means of an injector 19 of the form particularly shown in Figures 3 and 6 of the drawing. This is connected to an oil sup ply pipe having the two branches 17 and 18, and regulating means, such as the valve 20. The branch 17 of the oil pipe is connected with a tank or reservoir of oil (not shown) and the branch 18 is connected to one end of the conduit 15 in the standard.

The nozzle 19 has acentral air passage 22, and a branch air passage 23, and is secured to theend of'the branch 18 of the oil supply pipe. The nozzle is so positioned that the branch passage'23 is joined to the opening 14 through which air is discharged under pressure from the chamber 4. "The outer face of the nozzle 19 is provided with a series of grooves 24 which, when the nozzle is in position in the conduit 15, form passages around thecnozzle, permitting flow of oil from the oil supply pipe to the conduit 15. As air under pressure is forced through the nozzle the flow of oil from the oil supply pipe is induced, and the air and oil are pro ected into the conduit 15 in the form of spray, the required comparative proportions of air and oil to form any desired mixture being determined by regulation of the valves 13 and 20. i

The inner face of the chamber 5 is formed by the face of the standard 1, and the outer face thereof is formed by the plate 5 The plate 5 also forms a partition separating the chamber 5 and the storage chamber 29. Formedwith the plate 5 is a central projection 5* having an opening therein forming a journal for the inner end. of the shaft 3.

Tlie compression chamber '5 in which is 10- catedan eccentrically mounted rotary piston having slidable vanes, corresponding to those in the. chamber ,4 ,andoperating in a similar manner, receives the mixture of air and oil from the conduit 15 through the passage 16 in the standard. The mixture is carried by the vanes, 26 of the-piston 25 through the crescent-shaped space 27 between the rotary piston and the wall of the-compression chamher 5 to the. contracted-end of such space, thus putting it under a high degree ofcompression, and is then discharged'through a small passage 28 (shown by dotted-lines in Figure 5 into a chamber 29. The chamber 29, which receives the mixture and forms a communication between the compression chamber 5 and the discharge nozzle 30, is provided with means whereby any oil in a liquid state carried by the mixture in its passage through the chamber and precipitated shall automatically be removed from the bottom of the chamber and conducted to the oil supply pipe. To this end a screw plug 31 having a conical valve seat 32 in its po'sal of the parts it will be clear that when the pump is in operation, and any considerable quantity of oil accumulates in the bot-' tom of the chamber 29, the valve 36 will be unseated by the action of the float. In this way a communication is established through the central opening in the plug 31 and the pipe 33 between the bottom of the chamber 29 and the oil supply pipe. Thus any oil deposited by recipitatlon from the mixture in the cham er 29 will, when the valve 36 is unseated, be drawn into the oil supply pipe by the action of the injector 19 and be again mixed with air, vaporized, compressed, etc.

The pump hereinbefore described isof a construction involving no working parts liable to require repair or replacement be- The shaft 3 is rovided at that portion of a it which exten s across the passa e in the standard with a circumferentia groove 39 of a width corresponding to that of the passage. Consequently the mixture of. air and oil projected through the passage 15 b the action of the injector 19 passes through the groove 39, around and contacting with the shaft, and during the operation of the pump a sufiiciently large quantity of the oily mixture is retarded b the shaft to afiord am le lubrication for its bearing.

lie outer face of the chamber 29 has in it an opening 37 with which the nozzle is connected. The discharge end 38 of the nozzle is preferably contracted in order to retard the flow of the mixture of air and gas passing through it, and in this way to cause the mixture-to be discharged from the pump in a small jet under high pressure, thus aiding in the production of a mixture in the form of a spray containing minute particles of oil commingled with air. In practice it is found that air and oil commingled, compressed, freed from oil capable of precipitation, and finally discharged through. a contracted discharge opening emerges in substantially gaseous form.

' Consequently, when the mixture is ignited,

the resulting combustion is substantially complete and the quantity of free carbon liberated is negligible.

I claim:

1. A pump of the kind described com prising an air compression chamber havin 1 therein an eccentric rotary iston provide with radially disposed slidab e vanes, a compression chamber having therein an ecoentrio rotary piston provided with slidable radially disposed vanes, a conduit connectthe chambers, an injector having air and i oi passages located in the conduit, an oil supply pipe connected to the oil passages, a connection betwen the air passage and the air compression chamber, and a receiving chamber communicating with the compression chamber, and automatically operated means for withdrawin precipitated oil from the receiving cham er.

2. In a pump of the kind described, a standard having chambers formed in its opposite sides, removable plates forming the outer faces of the chambers and having openings forming-bearings for a shaft rotary' pistons connected to the shaft an arranged in the respective chambers, an inlet con uit formed in the standard, an injection nozzle arranged in the conduit, a passage connecting one of the chambers and the injector, and a passa e connecting-the conduit and the opposite hamber.

3. In a pump of the kind described, a standard having chambers formed in its 0 posite sides, removable plates forming t e outer faces of the chambers and having openings forming bearings for a shaft, rotary pistons connected to the shaft and arran 'ed in the respective chambers, an inlet con uit formed in the standard, an injector nozzle arranged in the conduit, the nozzle being provided with a central opening, a branch opening connected to the central opening said nozzle having longitudinally extending grooves in its outer face, a pas? sage connecting one of the chambers with the branch opening in the injector nozzle, and a passage connecting the conduit in the standard and the opposite chamber;

4. A pump of the kind described comprising a standard having a conduit extending therethrough and a shaft bearing at an angle to the conduit, a piston shaft arranged in the bearing and extending through the conduit, rotary pistons mounted on the shaft the portion of the shaft located in the conduit being provided with a circumferential groove, and means for forcing a fluid mixture through the conduit.

5. A pump of the kind described comprising two chambers having rotary vaned pistons therein, a conduit connecting thechambers, an injector located in the conduit' and communicating with one of the chambers and with the conduit, a supply pipe connected to the injector, a receivlng chamber connected to the chambers containing the istons, an openin in the lower portion of t 0 receiving chain er afloat valve governing the opening, an a connection between the opening and the supply pipe connected to the injector.

In testimony whereof-I afiix my signature.

J. STH. 

